Your question isn't very coherent. Should I understand that you wish to replace 12V halogen-heat-lamps with LEDs, but you don't know how to do this within NYSERD(whatever that is)?LED halogen-replacements should do you.

What efficiency standard has been laid down ? Halogens are a lot more efficient (24lm/W)than incandescents, LEDs 2..4 times better than that, but not as bright. CFL is probably still the way to go though